Here in the States CEN's stock radio was the Impact 3 and now the Skyion (the Sabre wasn't offered in the states). Both are bottom line radios and in my opinion shouldn't even be offered with a RTR truck. The cheap Hitec Agressor's and the Traxxis radios are considerably better.
The advantages to FM are more frequency's and allot less glitching problems and are allot less prone to interferance.
fastlane7, Have you contacted Airtronics?
http://www.airtronics.net/company_information.htm
They might be more help than CEN. The MX3 is a good radio.
rolland